Icon image for a portion of a display screen



FIG. 1 is a front view of an icon image for a portion of a display screen showing our new design; and,

FIG. 2 is a front view of a second embodiment thereof.

The broken line drawings of the portion of the display screen and the images within the square are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for an icon image for a portion of a display screen, as shown and described. 